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Hello, does the xp4 have the same trays and hose sizes as the xp3, xp2, etc? Does it just have the extra trays and higher volumetric flow pump? Thanks.

Yes. Everything is the same as the XP3, except you get an extra tray. I worked it out with a friend on another forum and we figured out that the XP3 actually has a bit more water pressure then the XP4 cause they use the same motor unit. So the XP4 is trying to push a higher volume wth the same motor.

Turtle man is exactly right. The XP4 also seem to have more problems because of the fact mentioned above with trying to push a higher volume with the same motor.

An XP3 is actually a better deal.